Since the dawns of humanity, people have used the cyclicity of time—sunrise/sunset, day/night—to make it measurable and easier to predict. Because when you know what follows, things are easier to deal with. Back in the day when people lived in caves, they used this known variation to optimize their hunting process. And then slowly, days turned into weeks, months and years. We invented work days and week-ends and now we know when to work and when to rest. Suddenly, at some point in history—most might not know it, but there is a perfectly logical explanation for this—the beginning of a new year has suffered a dramatic transformation. It swiftly became a threshold, a time when you leave the past behind, gaze into the future full of hope, and even make a resolution of some sort.
